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  1. #21

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    So got the engine fired up and slowly breaking her in.
    Put in an hour of varying idle to 5k rpms with the power commander doing its afr adjustments.
    Added a few fuel trims to the new fuel map and it runs better every time I do so.
    Pulled the spark plugs and they are looking really nice. Looks like timing, so far is leaving its markings on the side electrode by the 90 degree bend.
    New fuel pump, aeromotive 12345 in line fuel filter and pressure regulator holds strong at 58psi.
    I had a starting issue with the previous engine when it was hot or off for a while after running hot.
    It would flood the engine at every try, with no help from the riva tune.
    The Power commander's start-up fuel feature fix it right up, starts every time.
    I simply removed -12% fuel for 4 seconds at start up and BING! Starts every time even when cold.

    AFRs set up is as following with 94 octane. I can't tell what the timing is set for due to the Siemens ECU but spark plugs are telling me, not bad for up to 5k RPMs, so far.

    13.5 - 13.8 up to 6k, taper down to low 13s by 6.5k, then just under 13 at 7k, then slowly down to 12.5 at 8.5k

  2. #22

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    Hey guys, I did a couple short WOT runs and pulled the spark plugs for inspection. I may be wrong but does ignition timing appear to be okay by looking at these pictures? I was told to look at the Grey markings on the side electrode, it should end or start close to the 90degree bend. This was with the best possible Riva tune for this siemens ECU. Thank you.

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  3. #23
    Bob 1tommygunner1927's Avatar
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    Any black specs on the white? If no, that's a good sign ignition is not too advanced at 5000 rpm, however, at that rpm there is no boost. Typically with S/Cers boost begins at about 6000-6100 rpm. Side electrode helps determine heat rang of the plug, which appears acceptable. You will need a lighted loop to view carbon ring at the base of the ceramic/metal casing and it takes a trained eye to estimate a/f. You might invest in Dash Flash to view A/F in the instrument cluster.


  4. #24
    Mod less, ride more! troyheb's Avatar
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    If you are going to have issues you probably will not see it at 5000 rpm. Get into the boost and lets see.

  5. #25

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    I did 2 good wot runs of 8500 at 13 psi. Pulled the lanyard during second wot and inspected the spark plugs, pictures after doing so. Afrs with 58 Psi and riva tune, 94 octane, .5mm over pistons was high 11- low 12s at idle, Mid is nice, between 13-14.2 uup to 6000k . it then drops to 12 and creeps down to 11.7-11.5ish st 8500 and 13 psi boost.

  6. #26
    moparguy's Avatar
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    Quote Originally Posted by tiderider View Post
    I did 2 good wot runs of 8500 at 13 psi. Pulled the lanyard during second wot and inspected the spark plugs, pictures after doing so. Afrs with 58 Psi and riva tune, 94 octane, .5mm over pistons was high 11- low 12s at idle, Mid is nice, between 13-14.2 uup to 6000k . it then drops to 12 and creeps down to 11.7-11.5ish st 8500 and 13 psi boost.
    If you have a afr guage and your that rich on the topend. You have no worries about detonation

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